Put back erroneously removed zeroing of sentinel elements in indexkeys, classlist arrays.
Put back erroneously removed zeroing of sentinel elements
in indexkeys, classlist arrays.

arcivanov/postgres-xl,yazun/postgres-xl,postmind-net/postgres-xl,ahachete/gpdb,ahachete/gpdb,CraigHarris/gpdb,xinzweb/gpdb,lisakowen/gpdb,foyzur/gpdb,pavanvd/postgres-xl,lintzc/gpdb,snaga/postgres-xl,0x0FFF/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,randomtask1155/gpdb,royc1/gpdb,randomtask1155/gpdb,kaknikhil/gpdb,oberstet/postgres-xl,lisakowen/gpdb,yuanzhao/gpdb,chrishajas/gpdb,zaksoup/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,kaknikhil/gpdb,arcivanov/postgres-xl,0x0FFF/gpdb,randomtask1155/gpdb,rvs/gpdb,yuanzhao/gpdb,adam8157/gpdb,rubikloud/gpdb,royc1/gpdb,xinzweb/gpdb,atris/gpdb,jmcatamney/gpdb,atris/gpdb,Quikling/gpdb,yazun/postgres-xl,kaknikhil/gpdb,lintzc/gpdb,adam8157/gpdb,arcivanov/postgres-xl,janebeckman/gpdb,ashwinstar/gpdb,atris/gpdb,ahachete/gpdb,chrishajas/gpdb,yuanzhao/gpdb,zaksoup/gpdb,ovr/postgres-xl,royc1/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,snaga/postgres-xl,xinzweb/gpdb,chrishajas/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,rubikloud/gpdb,lisakowen/gpdb,50wu/gpdb,edespino/gpdb,kmjungersen/PostgresXL,50wu/gpdb,ahachete/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,edespino/gpdb,edespino/gpdb,xinzweb/gpdb,CraigHarris/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,rvs/gpdb,royc1/gpdb,0x0FFF/gpdb,atris/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,Chibin/gpdb,janebeckman/gpdb,rvs/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl,Chibin/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,foyzur/gpdb,rvs/gpdb,tangp3/gpdb,Quikling/gpdb,chrishajas/gpdb,zaksoup/gpdb,randomtask1155/gpdb,rvs/gpdb,rvs/gpdb,Chibin/gpdb,edespino/gpdb,lisakowen/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,50wu/gpdb,janebeckman/gpdb,arcivanov/postgres-xl,randomtask1155/gpdb,postmind-net/postgres-xl,rvs/gpdb,atris/gpdb,ashwinstar/gpdb,rubikloud/gpdb,adam8157/gpdb,foyzur/gpdb,ovr/postgres-xl,ahachete/gpdb,0x0FFF/gpdb,ahachete/gpdb,lintzc/gpdb,lintzc/gpdb,Quikling/gpdb,techdragon/Postgres-XL,adam8157/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,atris/gpdb,tangp3/gpdb,Chibin/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,techdragon/Postgres-XL,pavanvd/postgres-xl,zaksoup/gpdb,Chibin/gpdb,snaga/postgres-xl,greenplum-db/gpdb,foyzur/gpdb,yazun/postgres-xl,jmcatamney/gpdb,xuegang/gpdb,yuanzhao/gpdb,0x0FFF/gpdb,tangp3/gpdb,CraigHarris/gpdb,tangp3/gpdb,xinzweb/gpdb,yuanzhao/gpdb,oberstet/postgres-xl,CraigHarris/gpdb,royc1/gpdb,randomtask1155/gpdb,chrishajas/gpdb,edespino/gpdb,tangp3/gpdb,Chibin/gpdb,tangp3/gpdb,lisakowen/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,kmjungersen/PostgresXL,zaksoup/gpdb,kmjungersen/PostgresXL,Chibin/gpdb,foyzur/gpdb,greenplum-db/gpdb,lpetrov-pivotal/gpdb,Postgres-XL/Postgres-XL,kaknikhil/gpdb,janebeckman/gpdb,zeroae/postgres-xl,lisakowen/gpdb,snaga/postgres-xl,rubikloud/gpdb,lintzc/gpdb,Chibin/gpdb,cjcjameson/gpdb,janebeckman/gpdb,tpostgres-projects/tPostgres,arcivanov/postgres-xl,lisakowen/gpdb,zaksoup/gpdb,postmind-net/postgres-xl,techdragon/Postgres-XL,CraigHarris/gpdb,kmjungersen/PostgresXL,royc1/gpdb,rubikloud/gpdb,xuegang/gpdb,lpetrov-pivotal/gpdb,tpostgres-projects/tPostgres,foyzur/gpdb,xuegang/gpdb,lisakowen/gpdb,oberstet/postgres-xl,lintzc/gpdb,janebeckman/gpdb,jmcatamney/gpdb,Chibin/gpdb,edespino/gpdb,edespino/gpdb,oberstet/postgres-xl,tangp3/gpdb,rvs/gpdb,cjcjameson/gpdb,chrishajas/gpdb,xuegang/gpdb,foyzur/gpdb,CraigHarris/gpdb,tangp3/gpdb,chrishajas/gpdb,lintzc/gpdb,rubikloud/gpdb,kaknikhil/gpdb,janebeckman/gpdb,adam8157/gpdb,xinzweb/gpdb,adam8157/gpdb,rubikloud/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,ashwinstar/gpdb,pavanvd/postgres-xl,ovr/postgres-xl,yazun/postgres-xl,edespino/gpdb,atris/gpdb,pavanvd/postgres-xl,adam8157/gpdb,randomtask1155/gpdb,ovr/postgres-xl,greenplum-db/gpdb,ahachete/gpdb,xuegang/gpdb,jmcatamney/gpdb,50wu/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,foyzur/gpdb,royc1/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,adam8157/gpdb,janebeckman/gpdb,royc1/gpdb,greenplum-db/gpdb,Quikling/gpdb,edespino/gpdb,zeroae/postgres-xl,Quikling/gpdb,rvs/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,lpetrov-pivotal/gpdb,yazun/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,lpetrov-pivotal/gpdb,edespino/gpdb,jmcatamney/gpdb,xuegang/gpdb,atris/gpdb,jmcatamney/gpdb,Chibin/gpdb,ovr/postgres-xl,zaksoup/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,chrishajas/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,rvs/gpdb,cjcjameson/gpdb,Quikling/gpdb,snaga/postgres-xl,ashwinstar/gpdb,Quikling/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,xinzweb/gpdb,zeroae/postgres-xl,xuegang/gpdb,postmind-net/postgres-xl,0x0FFF/gpdb,cjcjameson/gpdb,50wu/gpdb,yuanzhao/gpdb,50wu/gpdb,randomtask1155/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,zaksoup/gpdb,Quikling/gpdb,xuegang/gpdb,Quikling/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,CraigHarris/gpdb,janebeckman/gpdb,lintzc/gpdb,xuegang/gpdb,cjcjameson/gpdb,tpostgres-projects/tPostgres,yuanzhao/gpdb